using System;
using System.Security.Cryptography;
using System.Text;

namespace Enyim.Caching.Memcached
{
	/// <summary>
	/// A key transformer which converts the item keys into their SHA1 hash.
	/// </summary>
	public class SHA1KeyTransformer : KeyTransformerBase
	{
		public override string Transform(string key)
		{
            var sh = SHA1.Create();
			byte[] data = sh.ComputeHash(Encoding.Unicode.GetBytes(key));

			return Convert.ToBase64String(data);
		}
	}
}

#region [ License information          ]
/* ************************************************************
 * 
 *    Copyright (c) 2010 Attila Kisk? enyim.com
 *    
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *    
 *        http://www.apache.org/licenses/LICENSE-2.0
 *    
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *    
 * ************************************************************/
#endregion
